128665954 has 8 divisors (see below), whose sum is σ = 197706348. Its totient is φ = 62763840.

The previous prime is 128665951. The next prime is 128665991. The reversal of 128665954 is 459566821.

It can be written as a sum of positive squares in 2 ways, for example, as 128210329 + 455625 = 11323^2 + 675^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (128665951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784467 + ... + 784630.

Almost surely, 2^128665954 is an apocalyptic number.

128665954 is a deficient number, since it is larger than the sum of its proper divisors (69040394).

128665954 is a wasteful number, since it uses less digits than its factorization.

128665954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569140.

The product of its digits is 518400, while the sum is 46.

The square root of 128665954 is about 11343.1016040587. The cubic root of 128665954 is about 504.8409184250.

The spelling of 128665954 in words is "one hundred twenty-eight million, six hundred sixty-five thousand, nine hundred fifty-four".